The perforating triplesteel tube bucklingrestrained brace is an energy damping device with the good performance. The structure of the triplesteel tube bucklingrestrained brace is introduced in this paper. In order to research the carrying capacity and hysteretic energy performance of the perforating triplesteel tube bucklingrestrained brace for different perforating types and gaps

ten different perforating types and sizes are designed to carry out a FEM analysis with softwares ANSYS and ABAQUS. The perforating triplesteel tube bucklingrestrained brace shows a stable hysteretic function and higher energy dissipation capacity

with the yielding point in the setting area. The perforating form and size influence the functions of the perforating triplesteel tube bucklingrestrained brace. The“confinement” effect of perforating triplesteel tube bucklingrestrained brace is significantly lower than that of traditional triplesteel tube bucklingrestrained brace. The carrying capacity of BRB does not reduce when the gap is not zero.